Hitachi RAS-(2-6)HVNP1(E), Service Manual

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8 Troubleshooting
220
SMGB0087 rev.0 - 12/2013
Alarm code
01
Activation of the safety device (flow switch) in the indoor unit (RPK only)
Indication of Outdoor Unit PCB
Indoor Unit No.
for Malfunction
Alarm code
Is alarm code “01” indi-
cated on LCD or 7-seg-
ment of O.U. PCB?
Is DSW2-1P on O.U.
PCB ON?
Turn OFF the power
source and then turn
OFF DSW2-1P on O.U.
PCB
Failure of I.U PCB or
disconnection of wir-
ing between PCB1 and
PCB2
Yes
No
Yes
Alarm code
02
Activation of the safety device (high pressure switch) in the outdoor unit
(Except Alarm codes 41 and 42) (For RAS-(2/2.5)HVNP1 and RAS-3HVNC1)
-
This alarm is indicated when one of safety devices is activated during compressor running.
Is it connected to connector
PCN401 of PCB1?
Plug connector correctly
Plug faston terminals to
PSH correctly
Is faston terminals
for PSH connected
to PSH correctly?
Faulty O.U.
PCB1
Faulty PCB
Check activation of the follow-
ing safety devices. Remove
the cause after checking.
PSH: 4.15MPa (R410A)
Is there the continuity between termi-
nal #1 and #3 of connector PCN401
during operation stop? (Y52C: OFF)
Yes
Yes
Yes
No
No
No